The math extension does not work in many wikis such as
https://rainworld.miraheze.org/wiki/Technical_Glossary
https://rosettacode.org/wiki/Triangular_numbers
https://sipnayan.miraheze.org/wiki/Tatsihaan
and probably all wikis that use the extension. Instead of formulæ parsing, the phrase “cache key is invalid” keeps appearing. Purging each page manually is only a temporary fix since the issue will reappear again several hours after it is purged.
A triangular number is a count of objects arranged into an equilateral triangle.
Much like how a square number is a count of objects arranged into a square.
The nth triangular number is the sum of the first n non-negative integers.
T
n
...
Ang trigonometriya o tatsíhaan (etimolohiya: tatsiha + an) (Ingles: trigonometry) ay ang pag-aaral ng tagway (ratio) ng mga gilid ng isang tatsulok. Dahil hindi pabago-bago ang tagway ng gilid at anggulo ng isang tatsulok, isa itong mabisang kagamitan upang hanapin ang sukat ng anggulo at gilid nito.